Which instrument is used for determination of particle size?

Step-by-step solution

Particle size determination requires direct imaging capabilities provided by electron microscopy techniques. SEM offers surface visualization for measuring particle dimensions through high-resolution topography, while TEM achieves higher resolution for nanoscale internal structure analysis and particle measurement. Spectroscopic methods prove unsuitable for direct size determination: FTIR identifies functional groups and chemical composition, and UV-visible spectroscopy quantifies concentrations and electronic tran